A method for preventing or treating a nervous disorder can include administrating to a person in need of such prevention or treatment a pharmaceutical preparation comprising, as an active ingredient, an ester of a decenoic acid. The ester of the decenoic acid can be selected from the group consisting of trans-2-decenoic acid ethyl ester, trans-2-decenoic acid methyl ester, trans-2-decenoic acid-2-decenyl ester, trans-2-decenoic acid cyclohexyl ester, trans-2-decenoic acid octyl ester, trans-2-decenoic acid isopropyl ester, trans-3-decenoic acid methyl ester, trans-3-decenoic acid ethyl ester, trans-9-decenoic acid methyl ester, and trans-9-decenoic acid ethyl ester.